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CVE-2020-7247

Published: 29 January 2020

smtp_mailaddr in smtp_session.c in OpenSMTPD 6.6, as used in OpenBSD 6.6 and other products, allows remote attackers to execute arbitrary commands as root via a crafted SMTP session, as demonstrated by shell metacharacters in a MAIL FROM field. This affects the "uncommented" default configuration. The issue exists because of an incorrect return value upon failure of input validation.

From the Ubuntu security team

It was discovered that OpenSMTPD incorrectly verified the sender's or receiver's e-mail addresses under certain conditions. An attacker could use this vulnerability to execute arbitrary commands as root.

Priority

High

CVSS 3 base score: 9.8

Status

Package Release Status
opensmtpd
Launchpad, Ubuntu, Debian
Upstream
Released (6.6.2p1-1)
Ubuntu 21.10 (Impish Indri) Not vulnerable
(6.6.2p1-1)
Ubuntu 21.04 (Hirsute Hippo) Not vulnerable
(6.6.2p1-1)
Ubuntu 20.04 LTS (Focal Fossa) Not vulnerable
(6.6.2p1-1)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (6.0.3p1-1ubuntu0.1)
Ubuntu 16.04 ESM (Xenial Xerus) Ignored
(end of standard support, was needed)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist

Patches:
Upstream: https://github.com/openbsd/src/commit/9dcfda045474d8903224d175907bfc29761dcb45